M1B-129
From The Stargate Omnipedia
Planet in the Pegasus Galaxy. The vicinity around the Stargate is shrouded in forest.
The Wraith chose this world to establish a science division. Concealed inside a cave they developed their experimental Wraith mind manipulator, a device they hoped would alter their prey's minds to their will.
The Wraith may have abandoned the project, as the Genii later discovered the technology and were unable to deactivate it.
DETAILS
HOME TO - Uninhabited
FIRST APPEARED - Phantoms
KEY EPISODE
Phantoms - Sheppard's team visits M1B-129 to investigate the loss of a reconnaissance unit who has since gone mad.